Specifications for Structural Concrete

1 ACI 301M-05 supersedes ACI 301M-99 and became effective October 17, 2005, American Concrete rights reserved including rights of reproduction and use in any form or by anymeans, including the making of copies by any photo process, or by electronic ormechanical device, printed, written, or oral, or recording for sound or visual reproductionor for use in any knowledge or retrieval system or device, unless permission in writingis obtained from the copyright proprietors. 301M-1 Specifications for Structural ConcreteAn ACI StandardReported by ACI Committee 301 ACI 301M-05 This specification is a Reference Specification that the Engineer or Archi-tect can make applicable to any construction project by citing it in theProject Specifications . The Architect/Engineer supplements the provisionsof this Reference Specification as needed by designating or specifying indi-vidual project document covers materials and proportioning of Concrete ; reinforc-ing and prestressing steels; production, placing, finishing, and curing ofconcrete; and formwork design and construction.

2 Methods of treatment ofjoints and embedded items, repair of surface defects, and finishing offormed and unformed surfaces are specified. Separate sections are devotedto architectural Concrete , lightweight Concrete , mass Concrete , prestressedconcrete, and shrinkage-compensating Concrete . Provisions governing test-ing, evaluation, and acceptance of Concrete as well as acceptance of thestructures are : admixture; aggregate; air entrainment; architectural Concrete ;cement; cementitious materials; cold weather; compressive strength; Concrete ; Concrete construction; Concrete durability; Concrete slab; consoli-dation; conveyor; curing; density; exposed-aggregate finish; finish; floors;formwork; grout; grouting; hot-weather; inspection; joint (construction,contraction, and isolation); lightweight Concrete ; mix; mixture proportion;placing; prestressed Concrete ; prestressing steel; reinforced Concrete ; rein-forcement; repair; reshoring; shoring; shrinkage-compensating Concrete ;specification; subgrade; temperature; test; tolerance; water-cementitiousmaterial ratio; welded wire B.

3 ArdahlMarwan A. DayeClifford Gordon David K. MaxwellDomingo J. Carreira*Mario R. DiazDavid P. Gustafson*Timothy L. MooreOleh B. CiukJames A. Farny*Jerry A. HollandJerry ParnesSteven R. Close*W. Bryant FryeRoy H. Keck*Aimee PergalskyD. Gene DanielRichard D. GaynorJames A. LeeJames M. Shilstone, Subcommittee MembersJames E. AndersonGene HightowerG. Michael RobinsonDaniel J. StanleyRamon L. CarrasquilloNarendra V. JadhavEdward D. RussellBruce A. SuprenantPaul A. DeckerMichael L. LemingMehmet A. SameeRobert L. TeermanDan Ellery William M. KlormanW. Thomas ScottMichael A. WhisonantAlphonse E. EngelmanMark A. PayneWilliam C. ShermanMichelle L. WilsonThomas M. GreeneKenneth B. RearDouglas J. SordylRichard M. WingConsulting MembersJeffrey W. ColemanGilbert J. HaddadRoss S. MartinJoseph A. McElroySteven H. GeblerAtilano LamanaBryant Mather Carlos VidelaW. Calvin McCallChairColin L. LoboSecretary*Subcommittee chair. TO SPECIFIERThis specification is incorporated by reference in theproject Specifications using the wording in P3 of the prefaceand including the information from the mandatory, optional,and submittal checklists following the ACI Specification 301M is intended to be used byreference or incorporation in its entirety in the Project Spec-ification.

4 Do not copy individual Parts, Sections, Articles, orParagraphs into the Project Specification, because takingthem out of context may change their If Sections or Parts of ACI Specification 301M arecopied into the Project Specification or any other document,301M-2 ACI STANDARDdo not refer to them as an ACI Specification, because thespecification has been A statement such as the following will serve to makeACI Specification 301M a part of the Project Specification: Work on (Project Title) shall conform to all requirementsof ACI 301M-05 published by the American Concrete Insti-tute, Farmington Hills, Michigan, except as modified bythese Contract Documents. P4. Each technical Section of ACI Specification 301M iswritten in the three-part Section format of the ConstructionSpecifications Institute, as adapted for ACI language is imperative and The Specification is written to the Contractor. When aprovision of this specification requires action on theContractor s part, the verb shall is used.

5 If the Contractoris allowed to exercise an option, the verb may or, whenlimited alternatives are available, the conjunctive phrase shall is used. Statements provided in the spec-ification as information to the contractor use the verbs may or will. Informational statements typically identify activi-ties or options that will be taken or may be taken by theOwner or the , p. 301M-1 SPECIFICATION:Section 1 General requirements, p. Work Work not Reference standards and cited Reference Cited field Standards-producing Testing agency Quality Testing Testing responsibilities of Testing responsibilities of Owner s testing tests on hardened Concrete Evaluation of Concrete strength Acceptance of Concrete field acceptance of Acceptance of Dimensional Strength of Protection of in-place Loading and support of Protection from mechanical injurySection 2 Formwork and formwork accessories, p. Performance and design Fabrication and Construction and erection of Removal of Reshoring and Strength of Concrete required for removal offormworkSection 3 Reinforcement and reinforcement supports, p.

6 Submittals, data, and Materials delivery, storage, and PlacementSection 4 Concrete mixtures, p. Quality Materials storage and Performance and design Measuring, batching, and DeliverySection 5 Handling, placing, and constructing,p. Delivery, storage, and Performance and design Placement of Finishing formed Finishing unformed Sawed contraction Curing and Repair of surface defectsSPECIFICATIONS FOR Structural CONCRETE301M-3 Section 6 Architectural Concrete , p. Quality Product delivery, storage, and Project Performance and design Proportioning Concrete Formwork Formwork Repair of tie holes and surface FinishingSection 7 Lightweight Concrete , p. Product delivery, storage, and Performance and design Batching and field quality controlSection 8 Mass Concrete , p. Performance and design Curing and protectionSection 9 Prestressed Concrete , p.

7 Quality Product delivery, handling, and Proportioning of Concrete and grout TensioningSection 10 Shrinkage-compensating Concrete ,p. General Performance and design Isolation-joint filler Isolation CuringNOTES TO SPECIFIER:Foreword to checklists, p. 301M-35 Mandatory requirements checklist, p. 301M-37 Optional requirements checklist, p. 301M-38 Submittals checklist, p. 301M-45 SECTION 1 GENERAL Work specified This Specification covers cast-in-place Structural of this Specification shall govern except whereother provisions are specified in the Contract Work not specified The following subjects are notin the scope of this specification: Precast Concrete products; Heavyweight shielding Concrete ; Slipformed paving Concrete ; Terrazzo; Insulating Concrete ; Refractory Concrete ; Shotcrete; Slipformed Concrete walls; and Tilt-up Concrete Definitionsacceptable or accepted acceptable to or accepted by Concrete field Testing Technician Grade 1 aperson who has demonstrated knowledge and ability toperform and record the results of ASTM standard tests onfreshly mixed Concrete and to make and cure test knowledge and ability shall be demonstrated bypassing prescribed written and performance examinationsand having credentials that are current with the AmericanConcrete or Engineer/Architect the Archi-tect, Engineer, architectural firm, engineering firm, or archi-tectural and engineering firm issuing project drawings and301M-4 ACI STANDARD Specifications or administering work under the Concrete Concrete that is exposed as aninterior or exterior surface in the completed structure and isdesignated as architectural Concrete in the Contract Documents.

8 Contributes to visual character of the completed structure andtherefore requires special care in the selection of the concretematerials, forming, placing, and finishing to obtain thedesired architectural shores placed snugly under a Concrete slabor Structural member after the original formwork and shoreshave been removed from a small area at a time, withoutallowing the slab or member to deflect, or support its ownweight or existing construction loads from , expansive a cement that, when mixed withwater, produces a paste that, after setting, tends to increase involume to a significantly greater degree than does portlandcement paste; used to compensate for volume decrease dueto shrinkage or to induce tensile stress in , expansive Type K a mixture of portlandcement, anhydrous tetracalcium trialuminate sulfate (C4A3S ), calcium sulfate (CaSO4), and lime (CaO); the C4A3 Sis a constituent of a separately burned clinker that is inter-ground with portland cement, or alternatively, is formedsimultaneously with the portland-cement clinker compoundsduring the burning Documents a set of documents supplied byOwner to Contractor as the basis for construction.

9 Thesedocuments contain contract forms, contract conditions, Specifications , drawings, addenda, and contract the person, firm, or entity under contract forconstruction of the a conduit (plain or corrugated) to accommodateprestressing steel for post-tensioned to public view situated so that it can be seenfrom a public location after completion of the Concrete Concrete that is capableof attaining specified strength at an earlier age than 28 daysthrough the use of high-early-strength cement or Concrete Concrete of substantially lowerdensity than normalweight Concrete any volume of Concrete with dimensionslarge enough to require that measures be taken to cope withgeneration of heat from hydration of the cement and atten-dant volume change to minimize Concrete , plain Mass Concrete containing no rein-forcement or less reinforcement than necessary to be consid-ered reinforced mass Concrete , reinforced mass Concrete containingadequate prestressed or nonprestressed reinforcement to acttogether with the Concrete in resisting forces including thoseinduced by temperature and Concrete Concrete having a density ofapproximately 2400 kg/m3 made with gravel or crushedstone the corporation, association, partnership,individual, public body, or authority for whom the Work accepted or acceptable to the Architect/Engineer; usually pertains to a request by the Contractor, orto an item specified in the Contract a method of prestressing reinforcedconcrete in which tendons are tensioned after the concretehas Concrete Concrete in which internal stressesof sufficient magnitude and distribution are introduced tocounteract to a desired degree the tensile stresses resultingfrom the service loads.

10 In reinforced Concrete , the prestressis commonly introduced by tensioning the drawings graphic presentation of Specifications the written document that detailsrequirements for the Work in accordance with serviceparameters and other specific specification a standardized mandatory-language document prescribing materials, dimensions, andworkmanship, incorporated by reference in Contract Docu-ments, with information in the Mandatory RequirementsChecklist required to be provided in the Project standards standardized mandatory-languagedocuments of a technical society, organization, or association,including codes of local or federal authorities, which areincorporated by reference in Contract required in this Specification or the shores placed snugly under a stripped concreteslab or other Structural member after the original forms andshores have been removed from a large area, thus requiringthe new slab or Structural member to deflect and support itsown weight and existing construction loads applied beforethe installation of the , prestressing a material encasing prestressingsteel to prevent bonding of the prestressing steel with thesurrounding Concrete , to provide corrosion protection, and tocontain the corrosion-inhibiting , wood formwork the materials forming thecontact face of forms; also called lagging or drawing a drawing that provides details for aparticular task that is developed by the Contractor andreviewed by the Engineer.